Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom of your library in a random order.)

When Borderland Explorer enters the battlefield, each player may discard a card. Each player who discarded a card this way may search his or her library for a basic land card, reveal it, put it into his or her hand, then shuffle his or her library.

When Gamekeeper dies, you may exile it. If you do, reveal cards from the top of your library until you reveal a creature card. Put that card onto the battlefield and put all other cards revealed this way into your graveyard.